Do black people really have extra muscles?
No: not extra muscles at all.. however, people from some genetic backgrounds in Africa (which has FAR more genetic diversity than Europe, so its completely innacurate to call them all simply "black") DO in fact have more "fast twitch" muscle fibers than the average person of European extraction. This gives them the ability, on the average, to move more quickly for shorter periods. (as in sprinting or basket-ball).. but on the other hand, there are OTHER gene-pools in Eastern Africa, where they have more "slow twitch" muscle fibers than the average, which enables them to be great long-distance runners: think Kenya, Tanzania and Uganda, for example. In many cultures of people of African descent, there is more emphasis put on physical strength, instead of brain-power: they were (and still are!!) discriminated against for such a long time, that sports and athletics were one of the easiest and most socially-acceptable ways for these groups to get ahead and succeed in life. SO, many parents of "black" children, along with their communities in general, encourage children to become strong and to take up and excel in a sport. Therefore, on the average they are more muscular as a result.
Thin upper body but fat thighs/legs?
I have a pretty thin upper body like I have a flat stomach, skinny arms, hip bones that actually protrude/ very visible but then there comes my thighs and butt...my legs are very unproportuined and I hate it!!! I do not eat candy or any crap food..I already do about 100 leg exercises everyday and do cardio very often but it's just "big and ugly" im 5'4 and 105 pounds..do you think if I lost 10 pounds my legs will slim down? I know that will leave me underweight but I'd rather have nice slimmed legs...
Why are the bones in a person's arms and legs different in diameter?
The bones in the legs need to be thicker to support the weight of the body.
Is it normal for a puppies front legs to do this? - pic is of a GSD pup?
German Shepherd puppies do tend to have large knees when they are puppies. Also large paws. Both that look out of proportion to the rest of their body. As the puppy grows the knee joint becomes flatter. Gsd pups always look like they are wearing Moon Boots! By 8- 9 months old the knees will be almost flat. The growth plates close at about 12-14 months old approx and the the dog has then reached full height and just has some filling out to do until about 2 years to 2 and a half years old.
If you soak your leg in vinegar will the bones be softened?
No, that's a false claim. Vinegar is a weak acid, not even as acidic as lemon juice (with a pH of 2.8 vs. 2.3), and soaking bandages in vinegar would only provide a very small amount of vinegar to react with anything. In addition, you have a lot of water-resistant skin and fat, and muscle tissue, between this small amount of vinegar, and the bones in your legs. Even without the skin, fat and muscle in your legs, the bones are very thick and strong, and would take a long time to dissolve with a lot more acidic substance than is available in some vinegar-soaked bandages. Finally, even if vinegar did manage to "dissolve" your leg bones, the bones would become rubbery and flexible, rather than weak and brittle. This would actually make them *harder* to break, as they'd be more likely to bend and flex. By way of demonstrating this, try using some chicken thigh bones - which are much weaker than human leg bones (just compare the thickness!) - and immersing them directly in a cup of vinegar. After 4 hours, you'll find that they're not really changed noticeably, even with this direct immersion. It takes a couple of days (at least) of direct immersion to make the bones noticeably weaker, and you'll then be able to remove the bones from the acid and bend them as if they were made of rubber or plastic.
Death by bone marrow entering your heart through the blood stream?
Not quite death by bone marrow entering your heart. What you're referring to is called "fat emboli syndrome" and occurs occasionally in long bone fractures. Fat and marrow from the non-mineralized core of the bone enters the bloodstream and is returned to the heart, but what kills you is the small particles clogging the small vessels of your lungs. You go into respiratory distress and can die because your blood can't circulate through the lungs and pick up oxygen. I'm in general surgery residency and have seen this syndrome a couple of times in trauma patients. Setting bones simply means realigning two displaced ends of a fractured bone.